games are not necessarily finite, with indefinite continuation being allowed. Berge examined the properties of such games with a thorough analysis. A 55-page paper based on his thesis, and with the same title, was published in 1953. Berge married Jane Gentaz (born 7 January 1925) on 29 December 1952; they had one child, Delphine, born on 1 March 1964. In 1952, before the award of his doctorate, Berge was appointed as a research assistant at the Centre National de la Recherche Scientifique. In 1957 he spent time in the United States as a visiting professor at Princeton University. He took part in the Economics Research Project there which was under contract with the Office of Naval Research. While in Princeton he undertook work which was presented in the paper Two theorems in graph theory published in the Proceedings of the National Academy of Sciences of the United States of America. This was one of his first papers on graph theory, his earlier work being on the theory of games and combinatorics. He was writing his famous book Théorie des graphes et ses applications (Graph theory and applications) at this time and had just published his book on the theory of games, Théorie générale des jeux à n personnes (General theory of games with n players) (1957). Returning to France from the United States, Berge took up the position on Director of research at the Centre national de la recherche scientifique. Also, in 1957 he was appointed as a professor in the Institute of Statistics of the University of Paris. Théorie des graphes et ses applications was published in 1958 and, remarkably, in the following year his third book, Espaces topologiques, fonctions multivoques (Topological Spaces, Multi-Valued Functions), was published. For a mathematician in their early thirties to publish three major books within as many years is a truly outstanding achievement. Beginning in 1952 he was a research assistant at the French National Centre for Scientific Research (CNRS), and from 1957 to 1964 he was a professor at the Institute of Statistics at the University of Paris. From 1965 to 1967 he directed the International Computing Centre in Rome. He was also associated with the Centre d'Analyse et de Mathématique Sociales (CAMS), a research center of École des hautes études en sciences sociales. He held visiting positions at Princeton University in 1957, Pennsylvania State University in 1968, and New York University in